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@uitrit tuts @stent @time GEORGE B. DURKEE AND WILLIAM II. MURRAY, OF CHICAGO, ILLINOIS, ASSIGNORS TO.`

THEMSELVES AND ISAAC T. SAFFORD, 0F SAME PLACE.

Letters Patent No. 71,862, dated Jecember 10, i867.

IMPROVEMENT IN PLhNING-MAGHINES FOR WOOD.

2O ALL WHOM IT MAY CONCERN:

Be it known that we, GEORGE B. DURKEE und WILLIAM II MURRAY, both of the city of Chicago, in the county of Cook, and State of Illinois, have invented certain newand useful Improvements in Planing and .Wood-Moulding'Machines; and we do declare that the following is a full, clear, and exact description of the construction and operation'of the same, reference being had to the annexed drawings, making a port oi' this specification, in Which-f- Figure l is a side` view..

Figure 2, an endview.

Figure 3, a sectional view on red -lines A B of iig. 2.

Figure 4, a front view, showing the cutter-heads` in different planes; and

Figure 5 a crosssection of mouldingfinishcd by the machine.

Like letters refer to the same .partsin all of the figures.

The nature and object of our invention consist in providing a. planing-machine with two cutter-heads, so that one 'will follow the other and give the Wood. a fine finish, and so that for Wood niouldings they can he set at different. iines, planes, or angles, and pinne boards bevelling ivith straight-edged knives, and, with properlyvformed knives, form monldings with heads turned under and grooves cut under the body of the wood, so as to producen variety {vith the same knives; in constructing the machine so that the plone or axis of rotation can be changed in both or either of the cutter-heads; in constructing the machine so that the line of cutting ci" either or hoth ican bre-changed from one side of the machine to the other, or adjusted so that one will cut exactly on the same part of the wood as the other; in improving tbecutter-hcad by making it of Aa single piece, and providing it with grooves or slots, so that the nuts which hold. the knife-bolts canvbe placed in the cutter-head Yinstead of on the outside, as heretofore has been done. l

Toena'ble others skilled in theart to make and use our and operation.

A is the frame on which the machine is fastened, and is to be made of any suitable material and form. B B are standards firmly attached to the frame, and slightly inclined to the rear. At thel top of the standards B `are inserted screws D, which pass through the heads of the standards and screw through connecting-bars e, which pass through the slots a laterally, andalso through lateral slots z' in the arm of the crosshead C. This,v connecting-har e has a head on one end and a nutY on the other end. By means of this -nut the hrass heed C, when properly adjusted, can he held firmly in its place. By these screws D theA incline of the cutter-heads is adjusteinnd either'end can be raised or lowered without changing the axis of rotation, and the txis of rotation can be adjustedecparately in each cutter-heudfand at any desired angle, so that we are enabled to 'cut under` the vertical line by a'rotary cutter, as 'shown in iig. 5. At the side opposite to the pulley-edicole is a side arm, f, projecting from the arm of the cross-bar C, to the outer end ot' which -is attached a head through which the screw Gr passes. Back of this erm is another crm, g, fitting into a slot made in the erm ,0, and having nlug attached .to it iittng the slot a, so that it will'slide up and down with C. The screw G is attached tothe arm o r berg by a head on the end of the screw, or by a swivel-joint. By this means the lateral out of the cutter heads is adjusted, so that one can be mede to cut directly in front yor rear of the other, or changed so as tokcut in di'erent places. I v l We make our cutterdheads E, l'with their journals, of a single piece of steel, so that there .is no getting out of order, slipping, or yielding. l.ihey revolve'in boxes, the lower half of which We cest with and upon the arms of the cross-head C.` Thefupper hait of the boxes is detachable, end' is held in pleee and adjusted by the screws b passing through the projection c. By removing the upper haif'of' the box the cutter-heads con be removed and changed at pleasure. The cutter-heads arel square, and are provided on each side with a T-sheped groove or cavity, provided with the additional groove or slot it, as shown in iig. '3. We place the nuts of the knife-bolts in this T-shaped groove instead of externally,.as has been heretoforedone.; und the advantages of i this arrangement are thnt we can use a larger nut inthe groove, so that the bearing is always secure; and, as

invention, we proceed to describe its construction d' insee 2 thc bolt-heads are outside, we can-makethem thin, and are thereby enabled to use a smaller cutter-head und shorter er narrower knives, so that there is less strain on the bolts. The groove or slot c admits ofthe passage of the bolts entirely through the nuts, so that their full strength can he obtained without any nice adjustments in the length of the bolts. 4 y

Four knives or cuttersvcan be used on each cutter-head; but for monldings where a rapid feed is notessential., one to each head will be found sufficient. The form ofthe knivesmust be adapted to the style of moulding desired; and by the use of two cutter-heads u. much greater variety can bo produced with ongles cut under, and with deeper grooves, as one knife can be made to do n. portion of the cutting, which will be finished by the one which follows; so that deep-end line grooves coin be made without long points on the cutters, which are diiicult to keep in order and liable to break. Great ndvanttgc will also be found in ordinary planing, as, by taking oif the rough and gritty or dirtyportions, and reducing the boards to an even thickness by the first cutter, it cri-n be followed by the second with n high motion and very sharp knives, which will give the boards a perfect finish and polish; and with mouldings, and in planing siding, a `bevelled odge cnn be given.

Having thus fully described our machine, whn-t we claim as new and as our invention, and desire to secure by Letters Patent, isy i 1. The employment of two separately adjustable eutteiheads in a single machine, so'thut the axis of one cutter may be at one angle and the other at a. different angle, und both cutters operating at the same time upon the same board, substantially as specifiedn 2. The cross-headsy C, cutter-heads E, screws D and G, in combination with the standards B, constructed and operating substantially as specified. A

WM. H. MURRAY, GEORGE B. DURKEE.

Witnesses:

L. L. BOND, E. A. WEST. 

